iOS: We've mentioned how the Wake N Shake Alarm Clock app forces you to shake your iPhone (and wake you up better) in the morning, but at $1.99 you might have been hesitant to check it out. For the rest of the week it's on sale for 99¢.

iOS: Despite its adorable name, Wake 'n' Shake is a cruel iPhone app that makes you…
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On top of being a fun way to wake up, a recent update to Wake N Shake added achievements for getting out of bed quickly. Basically, the more you wake up on time and the faster you respond, the higher your score is on leaderboards. It's a simple app, but if you struggle to wake up with an ordinary alarm, now's the time to give Wake N Shake a try. The sale's only got a little while left today before it bumps up to 99¢ for the rest of the week. Update: It looks like the free offering is already over, but Wake N Shake is still on sale for 99¢ for the rest of the week.